:root {
  --primary: #0d47a1;
  --primary-light: #1976d2;
  --accent: #00bcd4;
  --bg-main: #f4f8fc;
  --bg-card: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --container-max: 1200px;
  --shadow-sm: 0 2px 4px rgba(13, 71, 161, 0.04);
  --shadow-md: 0 6px 18px rgba(13, 71, 161, 0.08);
  --shadow-hover: 0 12px 24px rgba(13, 71, 161, 0.14);
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
}
body {
  line-height: 1.6;
  background: radial-gradient(circle at 10% 10%, #eef5fc 0%, #f4f8fc 100%);
}
.site-container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand-box {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-box img.ai-page-logo {
  max-height: 42px;
  width: auto;
  display: block;
}
.brand-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}
.nav-links li a {
  display: inline-block;
  padding: 8px 14px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s ease;
}
.nav-links li a:hover,
.nav-links li a.active {
  color: var(--primary-light);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #ffffff;
  padding: 10px 22px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(13, 71, 161, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(13, 71, 161, 0.3);
}
.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--primary);
  padding: 9px 20px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border: 1.5px solid var(--primary);
  transition: all 0.2s ease;
}
.btn-outline:hover {
  background: #eef5ff;
}
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-main);
}
.hero-section {
  padding: 70px 0 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero-tag {
  display: inline-block;
  background: rgba(13, 71, 161, 0.08);
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: 20px;
  margin-bottom: 20px;
  border: 1px solid rgba(13, 71, 161, 0.15);
}
.hero-title {
  font-size: 40px;
  line-height: 1.25;
  color: var(--text-main);
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}
.hero-title span {
  color: var(--primary);
}
.hero-desc {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 800px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-cta {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.stat-card {
  background: var(--bg-card);
  padding: 24px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease;
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.stat-num {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 6px;
}
.stat-label {
  font-size: 14px;
  color: var(--text-muted);
}
section {
  padding: 70px 0;
}
.section-header {
  text-align: center;
  margin-bottom: 45px;
}
.section-subtitle {
  font-size: 13px;
  font-weight: 700;
  color: var(--primary-light);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 8px;
}
.section-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.5px;
}
.platform-intro-card {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}
.intro-content h3 {
  font-size: 22px;
  color: var(--primary);
  margin-bottom: 16px;
}
.intro-content p {
  color: var(--text-muted);
  margin-bottom: 18px;
  line-height: 1.8;
}
.intro-points {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.intro-points li {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}
.intro-points li::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary-light);
}
.model-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  background: #f8fafc;
  padding: 24px;
  border-radius: 8px;
  border: 1px dashed var(--border-color);
}
.chip {
  background: #ffffff;
  border: 1px solid #cbd5e1;
  padding: 5px 12px;
  border-radius: 16px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-main);
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.service-card {
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border-color);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: #bad3f8;
}
.service-badge {
  align-self: flex-start;
  font-size: 12px;
  background: #eff6ff;
  color: var(--primary);
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
}
.service-card h4 {
  font-size: 18px;
  color: var(--text-main);
  margin-bottom: 10px;
}
.service-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  flex-grow: 1;
}
.workflow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
}
.step-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px 20px;
  text-align: center;
  position: relative;
}
.step-num {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin: 0 auto 16px;
}
.step-item h4 {
  font-size: 16px;
  margin-bottom: 8px;
}
.step-item p {
  font-size: 13px;
  color: var(--text-muted);
}
.media-showcase-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  align-items: center;
}
.media-box {
  background: var(--bg-card);
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.media-box img {
  width: 100%;
  height: auto;
  display: block;
}
.media-info {
  padding: 16px 20px;
}
.media-info h4 {
  font-size: 16px;
  margin-bottom: 6px;
}
.media-info p {
  font-size: 13px;
  color: var(--text-muted);
}
.rating-banner {
  background: linear-gradient(135deg, #0d47a1 0%, #1565c0 100%);
  color: #ffffff;
  border-radius: 12px;
  padding: 30px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}
.rating-score {
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
}
.rating-stars {
  color: #ffd166;
  font-size: 24px;
  margin-bottom: 4px;
}
.table-wrap {
  width: 100%;
  overflow-x: auto;
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid var(--border-color);
}
table.comparison-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  min-width: 600px;
}
table.comparison-table th,
table.comparison-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}
table.comparison-table th {
  background: #f8fafc;
  color: var(--text-main);
  font-weight: 600;
}
table.comparison-table tr:hover {
  background: #f1f7ff;
}
.highlight-cell {
  font-weight: 700;
  color: var(--primary);
}
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}
.review-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  align-items: center;
}
.reviewer-role {
  font-size: 12px;
  background: #eef5fc;
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}
.reviewer-name {
  font-weight: 700;
  font-size: 15px;
}
.review-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.faq-wrap {
  max-width: 900px;
  margin: 0 auto;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-question {
  width: 100%;
  padding: 18px 24px;
  background: none;
  border: none;
  outline: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-icon {
  font-size: 18px;
  font-weight: 400;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}
.faq-item.active .faq-icon {
  transform: rotate(45deg);
}
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}
.faq-item.active .faq-answer {
  padding-bottom: 18px;
  max-height: 200px;
}
.form-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 36px;
  box-shadow: var(--shadow-sm);
  max-width: 700px;
  margin: 0 auto;
}
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text-main);
}
.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 14px;
  color: var(--text-main);
  background: #ffffff;
  outline: none;
  transition: border-color 0.2s ease;
}
.form-control:focus {
  border-color: var(--primary-light);
}
textarea.form-control {
  resize: vertical;
  min-height: 100px;
}
.contact-meta-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
  text-align: center;
}
.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
}
.contact-card h5 {
  font-size: 15px;
  margin-bottom: 6px;
  color: var(--text-main);
}
.contact-card p {
  font-size: 13px;
  color: var(--text-muted);
}
.banner-section {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.banner-card {
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}
.banner-card img.ai-page-image {
  width: 100%;
  height: auto;
  display: block;
}
.article-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}
.article-link-item {
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 8px 14px;
  border-radius: 6px;
  text-decoration: none;
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  transition: all 0.2s ease;
}
.article-link-item:hover {
  border-color: var(--primary);
  background: #f1f7ff;
}
footer.site-footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 50px 0 25px;
  margin-top: 40px;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--border-color);
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 10px;
  line-height: 1.7;
}
.footer-col h5 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text-main);
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  text-decoration: none;
  margin-bottom: 8px;
}
.footer-col a:hover {
  color: var(--primary);
}
.footer-friend-links {
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-friend-links a {
  color: var(--text-muted);
  text-decoration: none;
}
.footer-friend-links a:hover {
  color: var(--primary);
}
.footer-bottom {
  text-align: center;
  padding-top: 20px;
  font-size: 13px;
  color: var(--text-muted);
}
.floating-widget {
  position: fixed;
  right: 24px;
  bottom: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.kefu-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(13, 71, 161, 0.3);
  font-weight: 700;
  font-size: 12px;
}
.kefu-modal {
  display: none;
  position: absolute;
  right: 60px;
  bottom: 0;
  background: #ffffff;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-hover);
  text-align: center;
  width: 160px;
}
.kefu-modal img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  margin-bottom: 6px;
}
.kefu-modal span {
  font-size: 12px;
  color: var(--text-muted);
}
@media (max-width: 992px) {
  .stat-grid, .workflow-steps, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .platform-intro-card, .media-showcase-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    grid-template-columns: 1fr;
  }
  .contact-meta-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .banner-section {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: #ffffff;
    flex-direction: column;
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
  }
  .nav-links.active {
    display: flex;
  }
  .menu-toggle {
    display: flex;
  }
  .hero-title {
    font-size: 28px;
  }
  .stat-grid, .workflow-steps, .reviews-grid, .contact-meta-grid {
    grid-template-columns: 1fr;
  }
  .rating-banner {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }
}